Changes in the Seven Kingdoms

Qin Shihuang unified the seven kingdoms. From 230 BC to 221 BC, Qin Shihuang Yingzheng used a series of political, military and diplomatic means to destroy the six vassal states of Han, Zhao, Wei, Chu, Yan and Qi, ending the hundreds of years of vassal separatism during the Warring States Period and achieving the first great unification in Chinese history. After Qin Shihuang unified the seven kingdoms, he implemented a series of reforms and measures, such as implementing the system of counties and counties, unifying weights and measures, and building the Great Wall. These measures had a profound impact on the development of Chinese history. Qin Shihuang's unification of the seven countries marked a new stage in Chinese history and laid the foundation for China's political, economic, cultural and other development.